I replaced the Walbro Carb on my Magnum engine when I first got it(one it was in need of a rebuild..and two I detest Walbro carbs that need a rebuild)..anywho..I noticed what looked like a restricter plate between the carb and the manifold..didnt think much of it at the time...BUT NOW ITS MAKING ME CRAZY trying to figure out what and why?...someone please help me with this !!!!LOL